Mobile power bank



FIG. 1 is a perspective view of a mobile power bank showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is second perspective view; and,

FIG. 9 is third perspective view showing the mobile power bank.

The broken lines in the figures depict portions of the article which form no part of the claimed design. 

CLAIM The ornamental design for a mobile power bank, as shown and described. 